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iOS 11.4 /11.3 Screen auto brightness not working/low in iPhone

After
installing the latest iOS 11.4 many iPhone X/8/7 users are complaining that
they cannot get the screen brightness auto increased to enough level to read from iPhone screen outside in the sunlight. Not only in sunlight the lights are poor but also in
case of shades as well it becomes difficult to read out on iPhone as the auto
brightness is nor working after upgrade to iOS 11.4. There was no issue found
with previous version of iOS with the same iPhone, but the auto brightness
issue started only with iOS 11.4. Surely the issue is with latest iOS released
by Apple which has created some trouble with brightness settings.

One
user reported this as “I’m facing the same problem brightness with iPhone X and
iOS 11.4 is not being adjust automatically according to intensity of light,
I’ve to set it manually each time.”

Every
time the user will have to set the brightness level manually.But even when the level is turned to max and
then 2-3 minutes later it happens again and screen losses its brightness. It’s
difficult to guess what is causing brightness to go low. To fix the issue of
low brightness in iPhone with iOS 11.4, please try below solutions:

Fix 1:
Toggle auto brightness

General/Accessibility/Display Accommodations- turn
on or off auto brightness.

Also
innew iOS 11 the brightness settings
have moved to new place, with update, the setting was moved from
settings>general>accessibility>display accommodations to

settings>general>accessibility>magnifier.
Please check there as well that the auto brightness is set.

Fix 2:
Zoom filter settings

For
some users the issue is fixed by changing below settings: General >
Accessibility > Zoom > Zoom Filter set to "None"

Fix 3:
Hard reset/ reset all settings

Try
hard resetting your device and see if it works, if no, you can reset the device
(please make sure takebackup of iPhone
before this): Tap Settings -> General -> Reset -> Reset All Settings.